Three-dimensional printer



FIG. 1 is a front perspective view of a three-dimensional printer showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view, the opposite side being a mirror image thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is another front perspective view thereof, with the door open;

FIG. 8 is a front view of FIG. 7; and,

FIG. 9 is a side view FIG. 7; the opposite side being a mirror image thereof.

The broken lines are for purposes of illustration only and form no part of the claimed design. 

CLAIM The ornamental design for a three-dimensional printer, as shown and described. 